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IEEE Malaysia International Conference on Communications (MICC)

Simulation of security performance for unipolar and bipolar Optical CDMA Network Systems

Hesham A. Bakarman, Ali Z. Ghazi Zahid, Feras N. Hasoon, Sahbudin B. Shaari, Mahamod B. Ismail

Published Dec 1, 2009• 0 citations
Publisher

Abstract

This paper presents security performance for incoherent unipolar and bipolar Optical CDMA Network Systems. The eavesdropper performance is investigated, by simulation, based on Modified Double Weight (MDW) Spectral Amplitude Optical CDMA. Our results show that using unipolar OCDMA code schemes based on MDW code system enhances the security with a low cost implementation in comparison to the bipolar ones.

DOI
10.1109/micc.2009.5431532

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This paper presents security performance for incoherent unipolar and bipolar Optical CDMA Network Systems. The eavesdropper performance is investigated, by simulation, based on Modified Double Weight (MDW) Spectral Amplitude Optical CDMA. Our results show that using unipolar OCDMA code schemes based on MDW code system enhances the security with a low cost implementation in comparison to the bipolar ones.
This paper presents security performance of spectral amplitude code OCDMA based on Modified Double Weight (MDW) OCDMA scheme. The eavesdropper probability of correctly detected Spectral Encoding Chip Bandwidth (SECB) pulses in a code word is investigated. For MDW code with code length and code weight of 9 and 4 respectively, SNR of approximately 8 dB is sufficient for an eavesdropper to detect the SECB pulses with a probability of 50%. The eavesdropper performance is based on tapping and observing the encoded transmitted signal using a tuning band pass filter followed by envelope detector. The eavesdropper measures the intensity for each intercepted pulse and calculates its corresponding sig- nal to noise ratio (SNR). Spectral Encoding Chip Bandwidth effect is investigated by simulation. The possibility of eavesdropping increases with wide SECB. Our results show that using unipolar OCDMA code schemes based on MDW code system enhances the security with a low cost implementation in comparison to the bipolar ones.
OCDMA) is an alternative method, which performs encoding and decoding through an optical signature code, in order to allow the selection of a desired signal so that different users can share the same bandwidth.In such a systems, data signal overlap both in time and wavelength.Tradeoffs between security and performance in optical CDMA are presented.Confidentiality against eavesdropper interception strategies for optical CDMA is considered.Coherent detection and combining signals shows better confidentiality than the incoherent one.Spectral amplitude optical CDMA based on Modified Double Weight (MDW) systems, with different code dimension, is investigated.Increasing the network system capacity or maximizing authorized specified SNRs will lead to eavesdropper to detect high SNRs.
In this paper, tradeoffs between security and performance in optical CDMA is presented. Confidentiality against eavesdropper interception strategies for optical CDMA is considered. Coherent detection and combining signals shows better confidentiality than the incoherent one. Spectral amplitude optical CDMA based on Modified Double Weight (MDW) systems, with different code dimension, is investigated. Increasing the network system capacity or maximizing authorized specified SNRs will lead the eavesdropper to detect high SNRs.
(OCDMA) is an alternative method, which performs encoding and decoding through an optical signature code, in order to allow the selection of the desired signal so that different users can share the same bandwidth. In such a system, the data signal overlap both in time and wavelength. Tradeoffs between security and performance in optical CDMA are presented. Confidentiality against eavesdropper interception strategies for optical CDMA is considered. Coherent detection and combining signals shows better confidentiality than the incoherent one. Spectral amplitude optical CDMA based on Modified Double Weight (MDW) systems, with different code dimension, is investigated. Increasing the network system capacity or maximizing authorized specified SNRs will lead to eavesdropper to detect high SNRs.
An enhancement of data networks security using a hybrid WDM and SAC/Optical CDMA System is proposed. Secure transmission for dedicated users is achieved by overlaying a covert channel onto a multichannel WDM network. The covert channel is spectrally encoded using spectral amplitude coding (SAC) with unipolar Modified Double Weight (MDW) as the signature address code. OCDMA improves service availability in the presence of physical infrastructure attacks. With the use of WDM channels, the difficulty for an eavesdropper to intercept and decode the secure signal is increased. A simulation is presented as a demonstration of the concept.
This paper presents the security enhancement for spectral amplitude coding optical CDMA. The eavesdropper probability of error-free code detection based on hybrid code system is investigated. Enhancement Double Weight (EDW) optical CDMA scheme and M-sequence codes are used as a hybrid code system. The eavesdropper performance is based on observing the authorized transmitted signal based on classical detection theory. The eavesdropper taps a coded transmission of a particular user and performs the necessary calculations to derive the transmitter's code word from these transmissions. If an eavesdropper could be forced to tap code pulses with low SNRs, a security enhancement can be obtained. An eavesdropper would need SNR of 9.2 dB to correctly detect encoded pulses with a probability of 50 % for the hybrid scheme, which is 5 and 3 dB higher than M-sequence and EDW schemes respectively. The difference in performance of the eavesdropper's receiver with envelope detection is getting small, especially at higher SNRs.